Hey Jerry. If you ever do get into Dos in ME then run format you should appreciate that you will delete your entire operating system and will be unable to do anything - but I don't think you will be able to format the disk while still using it. Your best bet is to use a bootdisk from Bootdisk.com, get to the A: prompt then run fdisk/format from there then go on to re-install your OS of choice.
Good luck
D...